/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFramework/Public/MLDeformerModel.h
Get the number of vertices in the base mesh (linear skinned skeletal mesh). This is the number of vertices in the DCC, so not the render vertex count.
The number of imported vertices inside linear skinned skeletal mesh.
int32 GetNumBaseMeshVerts() const